Category Archives: Security

Combatting SPAM in ISP Mail Servers

Fighting SPAM is not easy. Here’s an example of how we configured an ISP mail server cluster to reduce the SPAM load… Continue reading →

by barryo Posted on October 7, 2010

Posted in Case Studies, How-tos, Security | Tagged clamav, email, gray listing, grey listing, greylisting, iptables, ipv6, policyd, postfix, postfix policyd, postfix-gld, smtp, spam, spamassasin | Comments Off

SIP Brute Force Attacks on the Increase

On our own Asterisk PBX server for our office and on some customer boxes with open SIP ports, we have seen a dramatic rise in brute force SIP attacks. They all follow a very common pattern – just over 41,000 … Continue reading →

by barryo Posted on September 17, 2010

Posted in Asterisk, How-tos, Security | Tagged asterisk, brute force, fail2ban, security, sip | 1 Comment

Category Archives: Security

Combatting SPAM in ISP Mail Servers

SIP Brute Force Attacks on the Increase

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